Re: [Cellar] intro to ffv1

Dave,

This is helpful. It makes it clear that all three versions of FFV1 are
contained within a single spec. I support the change.

Best,
Tessa

On Wed, Jun 7, 2017 at 9:09 PM, Dave Rice <dave@dericed.com> wrote:

> HI all,
>
> With the current version of the ffv1 draft, it is not easy to understand
> that the document defines three distinct versions of FFV1. I extended the
> Introduction section to summarize the version history a bit and extend the
> introductory description. This changes the intro from:
>
> > The FFV1 video codec is a simple and efficient lossless intra-frame only
> codec.
>
> to:
>
> > This document describes FFV1, a lossless video encoding format. The
> design of FFV1 considers the storage of image characteristics, data fixity,
> and the optimized use of encoding time and storage requirements. FFV1 is
> designed to support a wide range of lossless video applications such as
> long-term audiovisual preservation, scientific imaging, screen recording,
> and other video encoding scenarios that seek to avoid the generational loss
> of lossy video encodings.
> >
> > This document defines a version 0, 1, and 3 of FFV1. The distinctions of
> the versions are provided throughout the document, but in summary:
> >
> > - Version 0 of FFV1 was the original implementation of FFV1 and has been
> in non-experimental use since April 14, 2006 [@?FFV1_V0].
> >
> > - Version 1 of FFV1 adds support of more video bit depths and has been
> in use since April 24, 2009 [@?FFV1_V1].
> >
> > - Version 2 of FFV1 only existed in experimental form and is not
> described by this document.
> >
> > - Version 3 of FFV1 adds several features such as increased description
> of the characteristics of the encoding images and embedded CRC data to
> support fixity verification of the encoding. Version 3 has been in
> non-experimental use since June 25, 2016 [@?FFV1_V3].
>
> The citation references point to the first public corresponding libav and
> ffmpeg commits that mark these points in the development of the encoding.
>
> The pull request is at https://github.com/FFmpeg/FFV1/pull/72. Comments?
>
> Best Regards,
> Dave Rice
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